MACLOSKIE: GRAMINE^E. 159 



/. Lateral nerves of floral glumes subparallel, not con- 

 verging. Empty glumes shorter than the floral. 

 m. Style developed. Lodicules connate. 



50. Panicularia (Glycerid), p. 219. 

 W2. Stigma sessile. Lodicules free. 



51. Atropis p. 220. 

 /2. Lateral nerves of floral glume arched, converging 



towards apex. Rachilla naked or downy or hairy. 

 m. Empty glumes carinate. Hilum punctiform. 

 Floral glume coriaceous at base or herbaceous 



and webbed. 52. Poa, p. 221. 

 m2. Empty glumes rounded on back. Hilum lineal. 

 Palea rough or ciliate on the keel. 



53. Festuca, p. 231. 



k2. Stigmas 2. arising subapically, on the anterior face of the 

 ovary. Empty glumes awnless. 



54. Bromus, p. 240. 



C2. Spikelets in 2 rows beside each other, forming a i -sided spike or raceme, with unarticu- 

 lated rachis ; all the spikelets hermaphrodite in the Patagonian species. (CHLORIDES.) 

 d. Only i hermaphrodite flower in each spikelet (very rarely 2). 



e. No empty glumes or male flowers. Only rarely a short pedicel extends above 

 the flower. No awns. Spikelets fall off as a whole. 



32. Spartina, p. 208. 

 2. Spikes digitately arranged. Spikelets not falling off. 



33. Capriola, p. 209. 



^3. Empty glumes i-several, above the hermaphrodite flower ; often small or 

 awn-like, rarely enclosing a male flower. Lower empty glumes 2. Spike- 

 lets 2-many, often like small fascicles. 

 /. Spikelets quasi-verticillate, or close together. Floral glume of the perfect 



flower i-awned or awnless. 34. Clitoris, p. 209. 



/2. Spikelets i-, rarely 2-flowered, sessile on subverticillate spikes. Upper 

 empty glume awned, and floriglume 3-awned. Rachilla produced and 

 variously glumiferous. 35. TricMoris, p. 210. 



/3- Spikelets remote, or approximate below ; the flowers close. Paleae not 



hairy. 36. Bouteloua, p. 2 1 1 . 



d2. Every spikelet having 2-3 hermaphrodite flowers. Spikes 1-3 at apex of culm, 

 erect. Floral glume with i awn between 2 obtuse apical lobes. 



37. Tctrapogon, p. 211. 

 3. Spikelets in 2, rarely more, opposing rows on a zigzag axis, forming a symmetrical, 



rarely a I -sided spike. (HoRDEvE.) . 



d. Spikelets solitary in the excavations of the rachis. 



e. Spikelets many-flowered, median on the rachis (the dorsal aspect of the glumes 

 being towards the rachis). Glumes subulate, i -nerved. 



55. Lolium, p. 244. 



e2. Spikelets i-2-flowered (sides of glumes toward the rachis; in slender articu- 

 late spikes). 56. Lepturus, p. 245. 



